variable principle的用法和样例：
例句
- In this paper the elastic and elastoplastic interal forces of Cable dome strueture are analysed by the energy Variational principle.
本文采用能量变分原理分析拉索穹顶结构的弹性和弹塑性内力。 - The general variational principle is employed in communicating information between subdomains with Lagrange multipliers, which yields a reduced-order coarse problem.
根据广义变分原理，采用拉格朗日乘子在子区域之间交换信息，并建立其相应的粗问题。
